php设计模式之桥接模式实例代码

php 
header("Content-type:text/html;charset=utf-8");

abstract class msg{
    protected $send = null;
    public function __construct($send){
        $this->send = $send;
    }
    abstract function msg($content);

    function send($to, $content){
        $content = $this->msg($content);
        $this->send->send($to, $content);
    }
}

/**
* 普通信
*/
class ZnMsg
{
    public function send($to, $content)
    {
        echo "给".$to."发送站内信：
".$content;
    }
}

/**
* email信
*/
class EmailMsg
{
    public function send($to, $content)
    {
        echo "给".$to."发送Email：
".$content;
    }
}

/**
* sms信
*/
class SmsMsg
{
    public function send($to, $content)
    {
        echo "给".$to."发送短信：
".$content;
    }
}

// 内容分为普通，加急，特急三种程度

/**
* 普通
*/
class CommonInfo extends msg
{
    
    public function msg($content)
    {
        return "普通：".$content."
";
    }
}

/**
* 加急
*/
class WarnInfo extends msg
{
    
    public function msg($content)
    {
        return "加急：".$content."
";
    }
}

/**
* 特急
*/
class DangerInfo extends msg
{
    
    public function msg($content)
    {
        return "特急：".$content."
";
    }
}

$DangerInfo = new DangerInfo(new EmailMsg());
$DangerInfo->send('小小','不要再去参加极限运动了');

$WarnInfo = new WarnInfo(new EmailMsg());
$WarnInfo->send('毛毛','马上过来办公室开会！');